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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Preconditions;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.Reader;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.nio.CharBuffer;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.LinkedList;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Queue;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>/**<a name="line.28"></a>
<span class="sourceLineNo">029</span> * A class for reading lines of text. Provides the same functionality<a name="line.29"></a>
<span class="sourceLineNo">030</span> * as {@link java.io.BufferedReader#readLine()} but for all {@link Readable}<a name="line.30"></a>
<span class="sourceLineNo">031</span> * objects, not just instances of {@link Reader}.<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * @author Chris Nokleberg<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @since 1.0<a name="line.34"></a>
<span class="sourceLineNo">035</span> */<a name="line.35"></a>
<span class="sourceLineNo">036</span>@Beta<a name="line.36"></a>
<span class="sourceLineNo">037</span>public final class LineReader {<a name="line.37"></a>
<span class="sourceLineNo">038</span>  private final Readable readable;<a name="line.38"></a>
<span class="sourceLineNo">039</span>  private final Reader reader;<a name="line.39"></a>
<span class="sourceLineNo">040</span>  private final char[] buf = new char[0x1000]; // 4K<a name="line.40"></a>
<span class="sourceLineNo">041</span>  private final CharBuffer cbuf = CharBuffer.wrap(buf);<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>  private final Queue&lt;String&gt; lines = new LinkedList&lt;String&gt;();<a name="line.43"></a>
<span class="sourceLineNo">044</span>  private final LineBuffer lineBuf = new LineBuffer() {<a name="line.44"></a>
<span class="sourceLineNo">045</span>    @Override protected void handleLine(String line, String end) {<a name="line.45"></a>
<span class="sourceLineNo">046</span>      lines.add(line);<a name="line.46"></a>
<span class="sourceLineNo">047</span>    }<a name="line.47"></a>
<span class="sourceLineNo">048</span>  };<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>  /**<a name="line.50"></a>
<span class="sourceLineNo">051</span>   * Creates a new instance that will read lines from the given<a name="line.51"></a>
<span class="sourceLineNo">052</span>   * {@code Readable} object.<a name="line.52"></a>
<span class="sourceLineNo">053</span>   */<a name="line.53"></a>
<span class="sourceLineNo">054</span>  public LineReader(Readable readable) {<a name="line.54"></a>
<span class="sourceLineNo">055</span>    Preconditions.checkNotNull(readable);<a name="line.55"></a>
<span class="sourceLineNo">056</span>    this.readable = readable;<a name="line.56"></a>
<span class="sourceLineNo">057</span>    this.reader = (readable instanceof Reader) ? (Reader) readable : null;<a name="line.57"></a>
<span class="sourceLineNo">058</span>  }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>  /**<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * Reads a line of text. A line is considered to be terminated by any<a name="line.61"></a>
<span class="sourceLineNo">062</span>   * one of a line feed ({@code '\n'}), a carriage return<a name="line.62"></a>
<span class="sourceLineNo">063</span>   * ({@code '\r'}), or a carriage return followed immediately by a linefeed<a name="line.63"></a>
<span class="sourceLineNo">064</span>   * ({@code "\r\n"}).<a name="line.64"></a>
<span class="sourceLineNo">065</span>   *<a name="line.65"></a>
<span class="sourceLineNo">066</span>   * @return a {@code String} containing the contents of the line, not<a name="line.66"></a>
<span class="sourceLineNo">067</span>   *     including any line-termination characters, or {@code null} if the<a name="line.67"></a>
<span class="sourceLineNo">068</span>   *     end of the stream has been reached.<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * @throws IOException if an I/O error occurs<a name="line.69"></a>
<span class="sourceLineNo">070</span>   */<a name="line.70"></a>
<span class="sourceLineNo">071</span>  public String readLine() throws IOException {<a name="line.71"></a>
<span class="sourceLineNo">072</span>    while (lines.peek() == null) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>      cbuf.clear();<a name="line.73"></a>
<span class="sourceLineNo">074</span>      // The default implementation of Reader#read(CharBuffer) allocates a<a name="line.74"></a>
<span class="sourceLineNo">075</span>      // temporary char[], so we call Reader#read(char[], int, int) instead.<a name="line.75"></a>
<span class="sourceLineNo">076</span>      int read = (reader != null)<a name="line.76"></a>
<span class="sourceLineNo">077</span>          ? reader.read(buf, 0, buf.length)<a name="line.77"></a>
<span class="sourceLineNo">078</span>          : readable.read(cbuf);<a name="line.78"></a>
<span class="sourceLineNo">079</span>      if (read == -1) {<a name="line.79"></a>
<span class="sourceLineNo">080</span>        lineBuf.finish();<a name="line.80"></a>
<span class="sourceLineNo">081</span>        break;<a name="line.81"></a>
<span class="sourceLineNo">082</span>      }<a name="line.82"></a>
<span class="sourceLineNo">083</span>      lineBuf.add(buf, 0, read);<a name="line.83"></a>
<span class="sourceLineNo">084</span>    }<a name="line.84"></a>
<span class="sourceLineNo">085</span>    return lines.poll();<a name="line.85"></a>
<span class="sourceLineNo">086</span>  }<a name="line.86"></a>
<span class="sourceLineNo">087</span>}<a name="line.87"></a>




























































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